Posted on 16 Jul 2025 in General
What Is Down Syndrome? Down syndrome is a genetic condition caused by an extra copy of chromosome 21, also called Trisomy 21. Instead of having two copies, people with Down syndrome have three copies of chromosome 21, which affects physical growth, learning, and development. Types of Down Syndrome Trisomy 21 (95%): Every cell has an extra chromosome 21. Translocation (3–4%): Part of chromosome 21 attaches to another...